Defensive publication

ABSTRACT

HEAT CURED COATINGS ARE PROVIDED FOR LEATHER AND MICROPOROUS POLYURETHANE OR POLYVINYL MATERIAL. THE COATINGS ARE PREPARED FROM AQUEOUS MIXTURES OF TRI-TO HEXAMETHYLOL MELAMINE WITH (1) DISPERSIONS OF ANIONIC POLYURETHANES, WITH (2) MIXTURES OF DISPERSIONS OF ANIONIC POLYURETHANES WITH VINYL LATEXES. OR WITH (3) DISPERSIONS OF GRAFT COPOLYMERS OF ETHYLENIC MONOMERS WITH THE ANIONIC POLYURETHANES. THE ANIONIC POLUURETHANES ARE PREFERABLY EMULSIFIER-FREE AQUEOUS DISPERSIONS OF POLYURETHANES HAVING 0.1 TO 3% BY WEIGHT OF SULFONATE AND/OR CARBOXYLATE GROUPS INTRODUCED BY COMBINING AN ALKALI SALT OF TAURINE, METHYLTAURINE, 6-AMINOCAPROIC ACID, GLYCINE, SULFANILIC ACID, DIAMINOBENZOIC ACID, ORNITHINE OR LYSINE, OR ADDITION PRODUCTS OF SULTONES WITH DIAMINES, WITH ISOCYANATE GROUP-CONTAINING PREPOLYMERS PRIOR TO OR SIMULTANEOUSLY WOTH DISPERSION IN WATER. THE GRAFT COPOLYMERS ARE PREPARED BY INTRODUCING MONOMERS INTO THE ANIONIC POLYURETHANE DISPERSION UNDER FREE-RADICAL POLYMERIZATION CONDITIONS. MONOMERS INCLUDE THE FREE ACIDS, ESTERS AND AMIDES OF SUCH UNSATURATED ACIDS AS ACRYLATES AND MALEATES, THEIR METHYLOL AMIDES, AND THE NITRILE MONOMERS, VINYL ESTERS, ETHERS, KETONES, AND AMIDES, HYDROCARBONS AS STYRENES, MONO AND DIOLEFINS, ETC. ANIONIC OR NONIONIC EMULSIFIERS OTHER THAN THE ANIONIC POLYURETHANE MAY OPTIONALLY BE USED. ACID CATALYST AND MODIFIERS SUCH AS PIGMENTS, DYES AND STABILIZERS, ETC. MAY BE INCLUDED.

UNITED STATES PATENT OFFICE Published at the request of the applicant orowner in accordance with the Notice of Dec. 16, 1969, 869 0.6. 687. Theabstracts of Defensive Publication applications are identified bydistinctly numbered series and are arranged chronologically. The headingof each abstract indicates the number of pages of specification,including claims and sheets of drawings contained in the application asoriginally filed. The files of these applications are available to thepublic-tor inspection and reproduction may be purchased for 30 cents asheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The I'gtent Oflice makes no assertion as tothe novelty of the disclosed subject matter;

PUBLISHED JULY 18, 1972 T900,008 PROCESS FOR TREATING SHEET MATERIALSWITH ANIONIC AQUEOUS POLYURETHANE DISPERSIONS Gerhard Ball, Cologne,Wolfgang Keberle and Karlheinz Kowalewski, Leverkusen, and Bruno Zorn,Cologne, Germany, assignors to Farbenfabriken Bayer Aktiengesellschaft,Leverkusen, Germany Filed Aug. 11, 1971, Ser. No. 170,961 Claimspriority, application Germany, Aug. 21, 1970, P 20 41 550.3 Int. Cl.(308d 9/10; (108g 37/32 US. Cl. 260-214 VA No Drawing. 15 PagesSpecification Heat cured coatings are provided for leather andmicroporous polyurethane or polyvinyl material. The coatings areprepared from aqueous mixtures of trito hexamethylol melamine with 1)dispersions of anionic polyurethanes, with (2) mixtures of dispersionsof anionic polyurethanes with vinyl latexes, or with (3) dispersions ofgraft copolymers of ethylenic monomers with the anionic polyurethanes.The anionic polyurethanes are preferably emulsifier-free aqueousdispersions of polyurethanes having 0.1 to 3% by weight of sulfonateand/or carboxylate groups introduced by combining an alkali salt oftaurine, methyltaurine, 6-arninocaproic acid, glycine, sulfanilic acid,diaminobenzoic acid, ornithine or lysine, or addition products ofsultones with diamines, with isocyanate group-containing prepolymersprior to or simultaneously with dispersion in Water. The graftcopolymers are prepared by introducing monomers into the anionicpolyurethane dispersion under free-radical polymerization conditions.Monomers include the free acids, esters and amides of such unsaturatedacids as acrylates and maleates, their methylol amides, and the nitrilemonomers, vinyl esters, ethers, ketones, and amides, hydrocarbons asstyrenes, mono and diolefins, etc. Anionic or nonionic emulsifiers otherthan the anionic polyurethane may optionally be used. Acid catalyst andmodifiers such as pigments, dyes and stabilizers, etc. may be included.

